350-001 · Question #47
350-001 Question #47: Real Exam Question with Answer & Explanation
The correct answer is B: Sub-optimal routing may occur since there is no area 1 adjacency between the ABRs.. The primary difference is that the GRE tunnel hides the real recipients under the outer IP header. The "transit" area, in that case, does not need to actually know all the prefixes. What it needs, though, is a default route that points towards the backbone. Suboptimal routing may
Question
Exhibit
Options
- AThere is no potential issue; OSPF will work fine in any condition.
- BSub-optimal routing may occur since there is no area 1 adjacency between the ABRs.
- CThis is a wrong OSPF configuration because all routers must be in area 0 only.
- DThis is a wrong OSPF configuration because /30 requires 0.0.0.3 wild card.
Explanation
The primary difference is that the GRE tunnel hides the real recipients under the outer IP header. The "transit" area, in that case, does not need to actually know all the prefixes. What it needs, though, is a default route that points towards the backbone. Suboptimal routing may occur, then, because the traffic from the "transit" area must first reach the backbone in order to get GRE- encapsulated and carried again through the "transit" area to the disconnected area.
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